Reactive Power Regulation Method for a Current Source Converter with Active Phase-Shifting

Abstract

The present application relates to a method for regulating reactive power of a current source converter with active commutation. When it is detected that the operating states of the DC power transmission system and the AC system connected to the DC power transmission system meet the preset judgment conditions, first control the current source converter with active commutation to be in the target active power mode, then determine the target reactive power to be adjusted when the current source converter with active commutation is in the active power mode, and obtain the target mapping relationship corresponding to the target active power mode. Finally, according to the target reactive power and the target mapping relationship, adjust the tap position of the converter transformer so that the reactive power exchanged between the current source converter with active commutation and the AC system connected to the current source converter with active commutation reaches the target reactive power. The above method can avoid the problem of active power change caused by directly adjusting the trigger angle or turn-off angle of the current source converter with active commutation in the prior art.

Description

Technical Field

[0001] The present application relates to the technical field of power systems, and particularly to a reactive power regulation method for a current source converter with active commutation ability. Background Art

[0002] High-voltage direct current (HVDC) transmission systems play a crucial role in power systems, especially in long-distance and large-capacity power transmission. HVDC systems convert alternating current (AC) into direct current (DC), effectively reducing energy losses during long-distance power transmission and improving transmission efficiency. However, under certain specific operating conditions, there may be an imbalance in reactive power supply between the converter and the AC system, either insufficient or excessive, which may lead to voltage fluctuations and affect the stability of the power system and the normal operation of equipment. Therefore, effectively regulating the reactive power balance in HVDC systems to ensure the stable operation and high-efficiency transmission of the power system is of great importance.

[0003] When the DC system operates at low power, the reactive power compensated by AC filters often exceeds the reactive power absorbed by the converter. Currently, the method of regulating reactive power balance is to adjust the firing angle or turn-off angle of the converter through the reactive power auxiliary control function (Quadrature Power Control, abbreviated as QPC) in the pole control system of HVDC projects, so that the converter itself absorbs more reactive power to avoid excessive AC bus voltage. However, due to the commutation failure accidents that occur in traditional current source line-commutated converters under low turn-off angle operating conditions, the QPC function cannot provide reactive power support for the AC system. In addition, while regulating reactive power, QPC will cause changes in active power and cannot achieve decoupled control of active power and reactive power.

[0004] As the core component of future HVDC systems, the current source converter with active commutation ability based on fully controlled devices exhibits significant technical advantages. This device realizes controllable commutation by actively turning off the fully controlled devices of the bridge arm. It not only has the ability to resist commutation failures caused by AC side faults but also can operate stably under low turn-off angle operating conditions and has the characteristic of wide-range turn-off angle operation. However, the existing reactive power control technology for current source converters with active commutation ability still follows the traditional QPC mode and fails to fully explore the potential advantages of providing reactive power support for the AC system and decoupled control of active / reactive power under the wide-range turn-off angle operation characteristic of the current source converter with active commutation ability. Summary of the Invention

[0005] Based on this, it is necessary to provide a reactive power regulation method for a current source converter with active commutation ability that can achieve reactive power support for the AC system and decoupled control of reactive power and active power to address the above technical problems.

[0006] In a first aspect, the present application provides a reactive power regulation method for an actively commutated current source converter, the method comprising:

[0007] When it is monitored that the operating states of the DC power transmission system and the AC system connected to the DC power transmission system meet a preset judgment condition, controlling the actively commutated current source converter to be in a target active power mode;

[0008] Determining the target reactive power to be adjusted when the actively commutated current source converter is in the active power mode, and obtaining a target mapping relationship corresponding to the target active power mode; the target mapping relationship represents the corresponding relationship between the tap position of the converter transformer and the target reactive power;

[0009] According to the target reactive power and the target mapping relationship, adjusting the tap position of the converter transformer so that the reactive power exchanged between the actively commutated current source converter and the AC system connected to the actively commutated current source converter reaches the target reactive power.

[0010] In one embodiment, adjusting the tap position of the converter transformer according to the target reactive power and the target mapping relationship includes:

[0011] Determining the target tap position of the converter transformer corresponding to the target reactive power according to the target mapping relationship;

[0012] Adjusting the tap position of the converter transformer to the target tap position.

[0013] In one embodiment, the method further includes:

[0014] Constructing an AC-DC system analysis model of the DC power transmission system;

[0015] Performing simulated tap position adjustment according to different tap positions of the converter transformer through the AC-DC system analysis model, and obtaining the reactive power consumed by the actively commutated current source converter corresponding to each tap position;

[0016] Determining a preset mapping relationship according to the corresponding relationship between different tap positions and different reactive powers.

[0017] In one embodiment, constructing an AC-DC system analysis model of the DC power transmission system includes:

[0018] Obtaining system-related parameters of the DC power transmission system;

[0019] Constructing an AC-DC system analysis model according to the system-related parameters.

[0020] In one embodiment, the system-related parameters include at least one of the parameters of a current-source converter with active commutation, the parameters of a converter transformer, and the parameters of the AC-side system.

[0021] In one embodiment, the AC-DC system analysis model is used to perform simulated tap adjustment according to different tap positions of the converter transformer, and the reactive power consumed by the current-source converter with active commutation corresponding to each tap position is obtained, including:

[0022] Determine different tap positions of the converter transformer under different active powers;

[0023] The AC-DC system analysis model is used to perform simulated tap adjustment according to different tap positions of the converter transformer under each active power, and the reactive power consumed by the current-source converter with active commutation corresponding to each tap position under different active powers is obtained.

[0024] In a second aspect, the present application also provides a reactive power regulation device for a current-source converter with active commutation. The device includes:

[0025] A monitoring module, configured to control the current-source converter with active commutation to be in a target active power mode when it is detected that the operating states of the DC power transmission system and the AC system connected to the DC power transmission system meet a preset judgment condition;

[0026] An acquisition module, configured to determine the target reactive power that needs to be adjusted when the current-source converter with active commutation is in the active power mode, and acquire the target mapping relationship corresponding to the target active power mode; the target mapping relationship represents the corresponding relationship between the tap position of the converter transformer and the target reactive power;

[0027] An adjustment module, configured to adjust the tap position of the converter transformer according to the target reactive power and the target mapping relationship, so that the reactive power exchanged between the current-source converter with active commutation and the AC system connected to the current-source converter with active commutation reaches the target reactive power.

[0028] In a third aspect, the present application also provides a control device. The control device includes a memory and a processor. The memory stores a control program, and when the processor executes the control program, the following steps are implemented:

[0029] When it is detected that the operating states of the DC power transmission system and the AC system connected to the DC power transmission system meet a preset judgment condition, control the current-source converter with active commutation to be in a target active power mode;

[0030] Determine the target reactive power that needs to be adjusted when the actively commutated current source converter is in the active power mode, and obtain the target mapping relationship corresponding to the target active power mode; the target mapping relationship represents the corresponding relationship between the tap position of the converter transformer and the target reactive power;

[0031] Adjust the tap position of the converter transformer according to the target reactive power and the target mapping relationship, so that the reactive power exchanged between the actively commutated current source converter and the AC system connected to the actively commutated current source converter reaches the target reactive power.

[0032] Fourthly, the present application also provides a readable storage medium, on which a control program is stored. When the control program is executed by a processor, the following steps are implemented:

[0033] When it is monitored that the operating states of the DC power transmission system and the AC system connected to the DC power transmission system meet the preset judgment conditions, control the actively commutated current source converter to be in the target active power mode;

[0034] Determine the target reactive power that needs to be adjusted when the actively commutated current source converter is in the active power mode, and obtain the target mapping relationship corresponding to the target active power mode; the target mapping relationship represents the corresponding relationship between the tap position of the converter transformer and the target reactive power;

[0035] Adjust the tap position of the converter transformer according to the target reactive power and the target mapping relationship, so that the reactive power exchanged between the actively commutated current source converter and the AC system connected to the actively commutated current source converter reaches the target reactive power.

[0036] Fifthly, the present application also provides a control program product, which includes a control program. When the control program is executed by a processor, the following steps are implemented:

[0037] When it is monitored that the operating states of the DC power transmission system and the AC system connected to the DC power transmission system meet the preset judgment conditions, control the actively commutated current source converter to be in the target active power mode;

[0038] Determine the target reactive power that needs to be adjusted when the actively commutated current source converter is in the active power mode, and obtain the target mapping relationship corresponding to the target active power mode; the target mapping relationship represents the corresponding relationship between the tap position of the converter transformer and the target reactive power;

[0039] Adjust the tap position of the converter transformer according to the target reactive power and the target mapping relationship, so that the reactive power exchanged between the actively commutated current source converter and the AC system connected to the actively commutated current source converter reaches the target reactive power.

[0040] The above reactive power regulation method for the actively commutated current source converter. When it is monitored that the operating states of the DC transmission system and the AC system connected to the DC transmission system meet the preset judgment conditions, first control the actively commutated current source converter to be in the target active power mode, then determine the target reactive power that needs to be regulated when the actively commutated current source converter is in the active power mode, and obtain the target mapping relationship corresponding to the target active power mode. Finally, adjust the tap position of the converter transformer according to the target reactive power and the target mapping relationship, so that the reactive power exchanged between the actively commutated current source converter and the AC system connected to the actively commutated current source converter reaches the target reactive power. Among them, the target mapping relationship represents the corresponding relationship between the tap position of the converter transformer and the target reactive power. In the above method, by controlling the actively commutated current source converter to be in the target active power mode, the active power transmission of the system can be kept unchanged. Then, by adjusting the tap position of the converter transformer to regulate the reactive power, the problem of active power change caused by directly adjusting the trigger angle or turn-off angle of the actively commutated current source converter in the prior art can be avoided. The above method can ensure that the active power remains unchanged when regulating the reactive power, realizing the active-reactive decoupling control of the converter. And because the HCC has the operating characteristic of wide range of turn-off angle, the reactive power regulation range of the above method is larger than that of the QPC. It can not only absorb the surplus reactive power of the AC system but also provide reactive power support for the AC system. And the reactive power regulation range of the above method can be changed by changing the rated turn-off angle of the converter: the larger the rated turn-off angle of the converter, the more reactive power support the above method can provide to the AC system; the smaller the rated turn-off angle of the converter, the more surplus reactive power the above method can absorb from the AC system. This helps to reduce the configuration capacity of the AC filter / capacitor bank / reactive power compensation device in the converter station, and improve the construction economy and operation flexibility of the HVDC transmission system. Description of the Drawings

[0041] Figure 1 It is a schematic structural diagram of the application environment in an embodiment;

[0042] Figure 2 It is a schematic topology diagram of an actively commutated current source converter (12-pulse hybrid commutation converter);

[0043] Figure 3 It is one of the schematic flowcharts of the reactive power regulation method for the actively commutated current source converter in an embodiment;

[0044] Figure 4 It is the second schematic flow chart of the reactive power regulation method for a current source converter with active commutation in an embodiment;

[0045] Figure 5 It is the third schematic flow chart of the reactive power regulation method for a current source converter with active commutation in an embodiment;

[0046] Figure 6 It is the fourth schematic flow chart of the reactive power regulation method for a current source converter with active commutation in an embodiment;

[0047] Figure 7 It is the fifth schematic flow chart of the reactive power regulation method for a current source converter with active commutation in an embodiment;

[0048] Figure 8 It is the structural block diagram of a reactive power regulation device for a current source converter with active commutation in an embodiment;

[0049] Figure 9 It is the internal structure diagram of a control device in an embodiment. Specific embodiments

[0050] In order to make the objectives, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0051] High Voltage Direct Current (HVDC) transmission systems play a crucial role in power systems, especially in long-distance and high-capacity power transmission. By converting alternating current (AC) to direct current (DC), HVDC systems effectively reduce energy losses during long-distance power transmission and improve transmission efficiency. However, under certain specific operating conditions, an imbalance may occur between the insufficient or excessive reactive power supply between the converter and the AC system, which may lead to voltage fluctuations and affect the stability of the power system and the normal operation of equipment. Therefore, effectively regulating the reactive power balance in HVDC systems to ensure the stable operation and high-efficiency transmission of the power system is of great importance. Currently, the method of regulating reactive power balance is to adjust the firing angle or turn-off angle of the converter through the reactive power auxiliary control function (Quadrature Power Control, abbreviated as QPC) in the pole control system of HVDC projects, so that the converter itself absorbs more reactive power and reduces the pressure on the AC system. However, due to commutation failure accidents occurring in traditional current-source grid-commutated converters under low turn-off angle operating conditions, reactive power support cannot be provided to the AC system through the QPC function. In addition, while adjusting reactive power, QPC causes changes in active power and cannot achieve decoupled control of active power and reactive power. As the core component of future HVDC systems, the current-source converter with active commutation based on fully controlled devices exhibits significant technical advantages. This device realizes controllable commutation by actively turning off the fully controlled devices in the bridge arm. It not only has the ability to resist commutation failures caused by AC side faults but also can operate stably under low turn-off angle conditions and has the characteristic of wide-range turn-off angle operation. However, the existing reactive power control technology for current-source converters with active commutation still follows the traditional QPC mode and fails to fully exploit the potential advantages of the current-source converter with active commutation in providing reactive power support to the AC system and decoupled control of active / reactive power under the characteristic of wide-range turn-off angle operation.

[0052] This application provides a reactive power regulation method for a current-source converter with active commutation, aiming to solve the above technical problems. The following embodiments will specifically illustrate the reactive power regulation method for the current-source converter with active commutation described in this application.

[0053] The reactive power regulation method for the current-source converter with active commutation provided in the embodiments of this application can be applied to, for example Figure 1In the application environment shown, the application environment includes a high-voltage direct current (HVDC) transmission system 10 and an alternating current (AC) system 20. The AC side of the HVDC transmission system 10 is connected to the AC system 20 through an AC line. Among them, the HVDC transmission system 10 includes a control device 101, a current source converter with active commutation 102, and a DC transmission line 103. The current source converter with active commutation 102 includes a converter bridge 1021, an equivalent commutation reactance 1022 of the converter, and a converter transformer 1023. The arms of the current source converter with active commutation 102 include fully controlled devices, and the active commutation of the arm current is realized by actively turning off the fully controlled devices. The control device 101 is connected to the current source converter with active commutation 102 through a communication port. The converter bridge 1021 is connected to the equivalent commutation reactance 1022 of the converter through an AC line. The equivalent commutation reactance 1022 of the converter is also connected to the converter transformer 1023 through an AC line. The converter transformer 1023 is also connected to the AC system 20 through an AC line. The AC system 20 includes an AC power grid 201 and an AC bus 202. The above control device 101 is used to monitor in real time the reactive power exchanged between the current source converter with active commutation 102 and the AC system 20, or to monitor in real time the voltage of the AC bus 202 in the AC system 20, and to adjust the reactive power in the case of reactive power imbalance, so that the current source converter with active commutation 102 and the AC system 20 restore reactive power balance. The above control device 101 can be, but is not limited to, a system server, various workstations, telecontrol communication equipment, an industrial control host, etc. The above current source converter with active commutation 102 can be a Hybrid Line Commutated Converter (HCC), or a Capacitor-Loaded Commutated Converter (CLCC), or other types of current source converters with active commutation. As Figure 2 shown, in the embodiment of the present application, a twelve-pulse hybrid commutation converter is taken as an example for illustration. The twelve-pulse hybrid commutation converter may include a plurality of arms. The plurality of arms include arm Y1, arm Y2, arm Y3, arm Y4, bridge Y5, arm Y6, and arm D1, arm D2, arm D3, arm D4, arm D5, arm D6. Each arm (taking arm Y1 as an example) may include a capacitor-loaded commutation valve. The capacitor-loaded commutation valve includes a series-connected IGCT (i.e., a fully controlled device), a drive circuit, a voltage-sharing circuit, and a metal oxide varistor (MOV).

[0054] Those skilled in the art can understand that Figure 1 、 Figure 2The structure shown is only a block diagram of some structures related to the solution of this application, and does not constitute a limitation on the actively commutated current source converter and the DC power transmission system to which the solution of this application is applied. The specific actively commutated current source converter and DC power transmission system may include more or fewer components than those shown in the figure, or combine some components, or have different component arrangements.

[0055] In one embodiment, as Figure 3 shown, a reactive power regulation method for an actively commutated current source converter is provided. Taking the control device in Figure 1 as an example, the method includes the following steps:

[0056] S201, when it is monitored that the operating states of the DC power transmission system and the AC system connected to the DC power transmission system meet the preset judgment conditions, control the actively commutated current source converter to be in the target active power mode.

[0057] Among them, the bridge arm of the actively commutated current source converter includes fully controlled devices, and the active commutation of the bridge arm current is realized by actively turning off the fully controlled devices. The topology structure of the actively commutated current source converter includes a commutation transformer. The preset judgment conditions include one or more of the reactive power exchanged between the actively commutated current source converter in the DC power transmission system and the AC system reaching the preset power threshold and the AC bus voltage in the AC system reaching the preset voltage threshold. The target active power mode is a mode with a constant power. The target active power corresponding to the target active power mode is within the power range for the normal operation of the actively commutated current source converter.

[0058] In the embodiments of the present application, the control device may in advance set a preset power threshold of reactive power and a preset voltage threshold of the AC bus voltage according to the power transmission requirements and operating settings of the DC power transmission system and the AC system as preset judgment conditions. Then, during the power transmission process of the DC power transmission system, the control device may use signal acquisition devices such as sensors to monitor the operating states of the DC power transmission system and the AC system connected to the DC power transmission system in real time. Specifically, it may monitor the reactive power generated by the exchange between the actively commutated current source converter in the DC power transmission system and the connected AC system, and / or, monitor in real time through the signal acquisition device that the AC bus voltage in the AC system reaches the preset voltage threshold. Specifically, the control device may directly monitor the reactive power through a reactive power monitor, and obtain the AC bus voltage through the monitoring module in the DC power transmission system. Optionally, the control device may first monitor the voltage and current generated between the actively commutated current source converter and the AC system, and then calculate the reactive power. Optionally, the control device may actively obtain the reactive power between the actively commutated current source converter and the AC system. Optionally, the actively commutated current source converter and the AC system may send their own electrical quantity information to the control device, and the control device determines the reactive power according to the electrical quantity information. Optionally, when the control device receives a start command sent by the tower device or a start command triggered by the user, it may also control the actively commutated current source converter to be in the target active power mode.

[0059] After the control device monitors the operating states of the DC power transmission system and the AC system, it may further determine whether the operating states of the DC power transmission system and the AC system meet the preset judgment conditions. When it is determined that the operating states of the DC power transmission system and the AC system meet the preset judgment conditions, it may control the actively commutated current source converter to be in the target active power mode. Specifically, it may control the actively commutated current source converter to keep the current active power unchanged, or it may control the actively commutated current source converter to keep the preset active power unchanged.

[0060] S202. Determine the target reactive power that needs to be adjusted when the actively commutated current source converter is in the active power mode, and obtain the target mapping relationship corresponding to the target active power mode; the target mapping relationship represents the corresponding relationship between the tap position of the converter transformer and the target reactive power.

[0061] Among them, the preset mapping relationship represents the corresponding relationship between the tap positions of the converter transformer and the reactive power under different active powers, including the adjustable reactive power corresponding to different tap positions of the converter transformer under different active powers. For example, at active power 1, tap position 1 - adjustable reactive power 1, tap position 2 - adjustable reactive power 2, tap position 3 - adjustable reactive power 3...; at active power 2, tap position 1 - adjustable reactive power 1, tap position 2 - adjustable reactive power 2, tap position 3 - adjustable reactive power 3...; at active power 3, tap position 1 - adjustable reactive power 1, tap position 2 - adjustable reactive power 2, tap position 3 - adjustable reactive power 3.... The target mapping relationship represents the corresponding relationship between the tap positions of the converter transformer and the target reactive power in the target active power mode, and specifically may include that at the target active power, tap position 1 - adjustable reactive power 1, tap position 2 - adjustable reactive power 2, tap position 3 - adjustable reactive power 3....

[0062] In the embodiment of the present application, the operation requirements of the AC system can be determined in advance according to manual experience or professional instruction manuals. Specifically, the operation requirements of the AC system may include one or more of the AC bus voltage being within a preset voltage range, setting the reactive power exchanged between the actively commutated current source converter and the AC system to a preset value (for example, the preset value can be 0, that is, no reactive power exchange occurs between the AC-DC systems). After the control device controls the actively commutated current source converter to be in the active power mode based on the above steps, the target reactive power to be adjusted in this active power mode can be determined according to the operation requirements of the AC system and the active power corresponding to the active power mode.

[0063] Based on the electrical parameters of the DC transmission system, the adjustable reactive power corresponding to each tap position of the converter transformer under different active powers can be determined in advance, and then a preset mapping relationship is constructed based on each tap position of the converter transformer and the adjustable reactive power, and the preset mapping relationship is stored in a preset storage path in the form of a table, for example, it can be stored in a database or cache. After the control device controls the actively commutated current source converter to be in the target active power mode, the preset mapping relationship can be called from the preset storage path, and then the preset mapping relationship corresponding to the active power with the same or similar value as the target active power value is selected from the preset mapping relationship as the target mapping relationship.

[0064] S203. Adjust the tap position of the converter transformer according to the target reactive power and the target mapping relationship, so that the reactive power exchanged between the actively commutated current source converter and the AC system connected to the actively commutated current source converter reaches the target reactive power.

[0065] In the embodiments of the present application, after the control device obtains the target reactive power to be adjusted when the current source converter with active commutation is in the active power mode based on the above steps, and obtains the target mapping relationship corresponding to the target active power mode, it can determine the tap position of the converter transformer to be adjusted according to the target reactive power and the target mapping relationship, and then adjust the tap position of the converter transformer to the tap position of the converter transformer to be adjusted, so as to release or absorb the reactive power corresponding to the tap position of the converter transformer, so as to achieve the effect that the reactive power exchanged between the current source converter with active commutation and the AC system reaches the target reactive power.

[0066] The reactive power regulation method of the current source converter with active commutation provided by the embodiments of the present application, when it is monitored that the operating states of the DC power transmission system and the AC system connected to the DC power transmission system meet the preset judgment conditions, first controls the current source converter with active commutation to be in the target active power mode, then determines the target reactive power to be adjusted when the current source converter with active commutation is in the active power mode, and obtains the target mapping relationship corresponding to the target active power mode. Finally, according to the target reactive power and the target mapping relationship, the tap position of the converter transformer is adjusted so that the reactive power exchanged between the current source converter with active commutation and the AC system connected to the current source converter with active commutation reaches the target reactive power. Among them, the target mapping relationship represents the corresponding relationship between the tap position of the converter transformer and the target reactive power. In the above method, by controlling the current source converter with active commutation to be in the target active power mode, the active power transmission of the system can be kept unchanged. Then, by adjusting the tap position of the converter transformer to adjust the reactive power, the problem of active power change caused by directly adjusting the trigger angle or turn-off angle of the current source converter with active commutation in the prior art can be avoided. The above method can ensure that the active power remains unchanged when adjusting the reactive power, and realize the active-reactive decoupled control of the converter. Moreover, due to the wide range of turn-off angle operation characteristics of HCC, the reactive power regulation range of the above method is larger than that of QPC, and it can not only absorb the surplus reactive power of the AC system but also provide reactive power support for the AC system. And the reactive power regulation range of the above method can be changed by changing the rated turn-off angle of the converter: the larger the rated turn-off angle of the converter, the more reactive power support the above method can provide to the AC system; the smaller the rated turn-off angle of the converter, the more surplus reactive power the above method can absorb from the AC system. It helps to reduce the configuration capacity of the AC filter / capacitor bank / reactive power compensation device of the converter station, and improve the construction economy and operation flexibility of the HVDC transmission system.

[0067] In one embodiment, a specific implementation manner for adjusting the tap position of the converter transformer is further provided, such as Figure 4As shown in the figure, "adjust the tap position of the converter transformer according to the target reactive power and the target mapping relationship" in S203 above includes:

[0068] S301. Determine the target tap position of the converter transformer corresponding to the target reactive power according to the target mapping relationship.

[0069] In the embodiment of the present application, after obtaining the target mapping relationship, the control device can screen out the tap position of the converter transformer that is the same as or close to the target reactive power value from the target mapping relationship, and then determine the tap position of the converter transformer corresponding to the target reactive power as the target tap position.

[0070] S302. Adjust the tap position of the converter transformer to the target position.

[0071] In the embodiment of the present application, after obtaining the target tap position of the converter transformer corresponding to the target reactive power based on the above steps, the control device can adjust the tap position of the converter transformer to the target position so that the reactive power exchanged between the actively commutated current source converter and the AC system connected to the actively commutated current source converter reaches the target reactive power.

[0072] In one embodiment, as Figure 5 shown, the reactive power regulation method of the above-mentioned actively commutated current source converter further includes:

[0073] S401. Construct an AC-DC system analysis model of the DC power transmission system.

[0074] Among them, the AC-DC system analysis model is used to represent the power transmission situation between the AC-DC systems.

[0075] In the embodiment of the present application, the control device can construct an AC-DC system analysis model, and then based on the AC-DC system analysis model, traverse the tap positions of the converter transformer one by one to construct a preset mapping relationship.

[0076] Specifically, as Figure 6 shown, "construct an AC-DC system analysis model of the DC power transmission system" in S401 includes:

[0077] S4011. Obtain the system-related parameters of the DC power transmission system.

[0078] Among them, the system-related parameters include the parameters of the actively commutated current source converter, the parameters of the converter transformer, and the parameters of the AC side system.

[0079] The parameters of the actively commutated current source converter include the ideal no-load DC voltage U of the actively commutated current source converter di0, the rated turn-off angle γ of the actively commutated current source converter, the inherent voltage drop U of the actively commutated current source converter T and the rated reactive power consumption Q of the actively commutated current source converter N One or more of the above.

[0080] Converter transformer parameters include the converter transformer turns ratio K, the rated turns ratio K of the converter transformer N , the adjustment amount ΔK per tap of the converter transformer pu and the number of tap adjustments T k At least one of the above.

[0081] AC side system parameters include the DC side voltage U of the inverter d , the DC side current I of the inverter d , the active power P on the DC side of the inverter d , the equivalent commutation reactance X of the inverter T , the reactive power exchange ΔQ between the AC and DC systems, the short-circuit capacity S of the AC system ac , the rated capacity Q of the mth reactive power group cm , the rated voltage U of the AC bus acN and the change in AC bus voltage ΔU ac One or more of the above.

[0082] Among them, the operating range of the turn-off angle of the actively commutated current source converter is generally 7° - 25°, and the recommended rated turn-off angle range is 7° - 17°. The smaller the rated turn-off angle (the closer to 7°), the smaller the surplus reactive power that the actively commutated current source converter can generate, and the larger the surplus reactive power that can be absorbed; the larger the rated turn-off angle (the closer to 17°), the larger the surplus reactive power that the actively commutated current source converter can generate, and the smaller the surplus reactive power that can be absorbed; the rated turn-off angle can be determined according to the reactive power regulation ability requirements of the AC system (the amount of surplus reactive power that requires the actively commutated current source converter to absorb or generate).

[0083] In the embodiments of the present application, the control device can obtain the system-related parameters of the DC transmission system based on the equipment manual of the DC transmission system or manual input, etc.

[0084] S4012, construct an AC-DC system analysis model according to the system-related parameters.

[0085] In the embodiments of the present application, after the control device obtains the system-related parameters of the DC transmission system based on the above steps, it can construct an AC-DC system analysis model according to the system-related parameters of the DC transmission system. The specific AC-DC system analysis model can be represented by the following relational expressions:

[0086]

[0087] Among them, U di0 is the ideal no-load DC voltage of the actively commutated current source converter, γ is the rated commutation angle of the actively commutated current source converter, U T is the inherent voltage drop of the actively commutated current source converter, Q N is the rated reactive power consumption of the actively commutated current source converter, K is the turns ratio of the commutation transformer, K N is the rated turns ratio of the commutation transformer, △K pu is the adjustment amount of each tap of the commutation transformer, T k is the number of tap adjustments, K is the turns ratio of the commutation transformer, △Q is the reactive power exchange between the AC and DC systems, S ac is the short-circuit capacity of the AC system, Q cm is the rated capacity of the mth reactive power group, and M is the total number of reactive power groups. U acN is the rated voltage of the AC bus, △U ac is the change in the AC bus voltage, U d is the DC-side voltage of the inverter, I d is the DC-side current of the inverter, P d is the active power on the DC side of the inverter, X T is the equivalent commutation reactance of the inverter. Among them, the rated parameters of the given system are U d , U acN , the inherent parameters of the system are K N , T k , U T , X T , Q c and the AC system conditions S ac .

[0088] S402. Through the AC-DC system analysis model, simulate the tap adjustment according to different taps of the commutation transformer to obtain the reactive power consumed by the actively commutated current source converter corresponding to each tap.

[0089] In the embodiment of the present application, after the control device constructs the AC-DC system analysis model based on the above steps, it can simulate the tap adjustment according to different taps of the commutation transformer to obtain the reactive power consumed by the actively commutated current source converter corresponding to each tap, that is, input different taps under different active powers of the commutation transformer tap into the AC-DC system analysis model, and solve the AC-DC system analysis model through the Newton method to obtain the reactive power consumed by the actively commutated current source converter corresponding to each tap.

[0090] Specifically, as Figure 7 shown, "simulate the tap adjustment according to different taps of the commutation transformer through the AC-DC system analysis model to obtain the reactive power consumed by the actively commutated current source converter corresponding to each tap" in S402 includes:

[0091] S4021. Determine different tap positions of the converter transformer at different active powers.

[0092] In the embodiment of the present application, different active powers can be determined according to the power range in which the converter transformer operates normally, and then for each active power, different tap positions of the converter transformer at this active power can be further determined until different tap positions of the converter transformer at all active powers are obtained.

[0093] S4022. Perform simulated tap position adjustment according to different tap positions of the converter transformer at each active power through the AC-DC system analysis model to obtain the reactive power corresponding to each tap position at different active powers.

[0094] In the embodiment of the present application, after the control device obtains different tap positions of the converter transformer at different active powers based on the above steps, then for an active power, the active power P on the DC side of the inverter d is kept constant at this active power, and then simulated tap position adjustment is performed according to different tap positions of the converter transformer to obtain the reactive power corresponding to each tap position at this active power. Repeat the above steps until the reactive power corresponding to each tap position at different active powers is obtained.

[0095] S403. Determine the preset mapping relationship according to the corresponding relationship between different tap positions and different reactive powers.

[0096] In the embodiment of the present application, after the control device obtains the corresponding relationship between different tap positions and different reactive powers, the preset mapping relationship can be determined according to the corresponding relationship between different tap positions and different reactive powers, and the preset mapping relationship is stored in the form of a table at the preset storage path, for example, it can be stored in a database or cache.

[0097] Combining all the above embodiments, a reactive power regulation method for an actively commutated current source converter is further provided. The method includes:

[0098] S501. Obtain the system-related parameters of the DC transmission system. Among them, the system-related parameters include at least one of the parameters of the actively commutated current source converter, the parameters of the converter transformer, and the parameters of the AC side system.

[0099] S502. Construct an AC-DC system analysis model according to the system-related parameters.

[0100] S503. Determine different tap positions of the converter transformer at different active powers.

[0101] S504. Adjust the simulated gear according to different gears of the tap changer of the converter transformer through the AC / DC system analysis model, and obtain the reactive power consumed by the current-source converter with active commutation corresponding to each gear.

[0102] S505. Determine the preset mapping relationship according to the corresponding relationship between different gears and different reactive powers.

[0103] S506. When it is monitored that the operating states of the DC transmission system and the AC system connected to the DC transmission system meet the preset judgment conditions, control the current-source converter with active commutation to be in the target active power mode.

[0104] S507. Determine the target reactive power that needs to be adjusted when the current-source converter with active commutation is in the active power mode, and obtain the target mapping relationship corresponding to the target active power mode; the target mapping relationship represents the corresponding relationship between the tap changer gear of the converter transformer and the target reactive power.

[0105] S508. Determine the target gear of the tap changer of the converter transformer corresponding to the target reactive power according to the target mapping relationship.

[0106] S509. Adjust the tap changer gear of the converter transformer to the target gear so that the reactive power exchanged between the current-source converter with active commutation and the AC system connected to the current-source converter with active commutation reaches the target reactive power.

[0107] Compared with the QPC function that only uses the firing angle / turn-off angle as the control variable in the traditional LCC reactive power control system, the method described in the embodiments of this application can control the reactive power of the HCC without changing the active power transmission of the system, realize the active-reactive decoupling control of the HCC, and improve the operation flexibility of the high-voltage DC transmission system. Moreover, due to the wide-range turn-off angle operation characteristic of the HCC, the reactive power regulation range of the above method is larger than that of the QPC. It can not only absorb reactive power but also provide surplus reactive power for the AC system. And the larger the rated turn-off angle, the more surplus reactive power the control strategy can provide. It can give full play to the wide-range turn-off angle operation characteristic of the HCC, realize flexible reactive power support for the AC system, help to reduce the configuration capacity of the AC filters / capacitor banks / reactive power compensation devices at the converter station, and improve the construction economy and operation flexibility of the high-voltage DC transmission system.

[0108] The methods described in the above steps are all described in the foregoing embodiments. For detailed content, please refer to the foregoing description and will not be elaborated here.

[0109] It should be understood that although the steps in the flowcharts involved in the above-described embodiments are sequentially shown according to the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless there is a clear indication in this article, the execution of these steps has no strict order limit, and these steps can be executed in other orders. Moreover, at least a part of the steps in the flowcharts involved in the above-described embodiments may include multiple steps or multiple stages. These steps or stages are not necessarily executed at the same time, but can be executed at different times. The execution order of these steps or stages is not necessarily sequential, but can be executed alternately or in turn with at least a part of other steps or steps or stages in other steps.

[0110] In one embodiment, an industrial automation control system (such as a programmable logic controller PLC or a distributed control system, etc.) is further provided. The industrial automation control system includes a control device, and the control device is used to execute the reactive power regulation method of the current source type converter with active commutation described in any of the above embodiments.

[0111] Based on the same inventive concept, an embodiment of the present application further provides a reactive power regulation device for a current source type converter with active commutation for implementing the reactive power regulation method of the current source type converter with active commutation involved above. The solution provided by this device to solve the problem is similar to the solution described in the above method. Therefore, the specific limitations in one or more embodiments of the reactive power regulation device for a current source type converter with active commutation provided below can refer to the limitations on the reactive power regulation method of the current source type converter with active commutation in the above text, and will not be repeated here.

[0112] In one embodiment, as Figure 8 shown, a reactive power regulation device for a current source type converter with active commutation is provided, including:

[0113] A monitoring module 11, configured to control the current source type converter with active commutation to be in a target active power mode when it is detected that the operating states of the DC power transmission system and the AC system connected to the DC power transmission system meet a preset judgment condition.

[0114] An acquisition module 12, configured to determine the target reactive power to be adjusted when the current source type converter with active commutation is in the active power mode, and acquire the target mapping relationship corresponding to the target active power mode; the target mapping relationship represents the corresponding relationship between the tap position of the converter transformer and the target reactive power.

[0115] The adjustment module 13 is configured to adjust the tap position of the converter transformer according to the target reactive power and the target mapping relationship, so that the reactive power exchanged between the actively commutated current source converter and the AC system connected to the actively commutated current source converter reaches the target reactive power.

[0116] In one embodiment, the above adjustment module includes:

[0117] A determination unit configured to determine the target tap position of the converter transformer corresponding to the target reactive power according to the target mapping relationship.

[0118] An adjustment unit configured to adjust the tap position of the converter transformer to the target tap position.

[0119] In one embodiment, the reactive power adjustment device of the above actively commutated current source converter further includes:

[0120] A construction module configured to construct an AC-DC system analysis model of the DC power transmission system.

[0121] A first determination module configured to perform simulated tap position adjustment according to different tap positions of the converter transformer through the AC-DC system analysis model, and obtain the reactive power consumed by the actively commutated current source converter corresponding to each tap position.

[0122] A second determination module configured to determine a preset mapping relationship according to the corresponding relationship between different tap positions and different reactive powers.

[0123] In one embodiment, the above construction module includes:

[0124] An acquisition unit configured to acquire system-related parameters of the DC power transmission system. Wherein, the system-related parameters include at least one of actively commutated current source converter parameters, converter transformer parameters, and AC side system parameters.

[0125] A construction unit configured to construct an AC-DC system analysis model according to the system-related parameters.

[0126] In one embodiment, the above first determination module includes:

[0127] A first determination subunit configured to determine different tap positions of the converter transformer under different active powers.

[0128] A second determination subunit configured to perform simulated tap position adjustment according to different tap positions of the converter transformer under each active power through the AC-DC system analysis model, and obtain the reactive power consumed by the actively commutated current source converter corresponding to each tap position under different active powers.

[0129] Each module in the reactive power regulation device of the above-mentioned current source type converter with active commutation can be implemented in whole or in part by software, hardware, or a combination thereof. Each of the above modules can be embedded in the processor in the control device in hardware form or be independent of it, or be stored in the memory in the control device in software form, so that the processor can call and execute the operations corresponding to each of the above modules.

[0130] In one embodiment, a control device is provided. The control device can be a terminal, or a server or a workstation. Its internal structural diagram can be as Figure 9 shown. The control device includes a processor, a memory, an input / output interface, a communication interface, a display unit, and an input device. Among them, the processor, the memory, and the input / output interface are connected through a system bus, and the communication interface, the display unit, and the input device are connected to the system bus through the input / output interface. Among them, the processor of the control device is used to provide computing and control capabilities. The memory of the control device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a control program. The internal memory provides an environment for the operation of the operating system and the control program in the non-volatile storage medium. The input / output interface of the control device is used for the processor to exchange information with external devices. The communication interface of the control device is used to communicate with external terminals or distributed I / O measurement and control units in a wired or wireless manner. The wired manner can be implemented through a CAN bus, a TDM bus, fiber optic transmission, a LAN network, or other technologies, and the wireless manner can be implemented through WIFI, a mobile cellular network, NFC (Near Field Communication), or other technologies. When the control program is executed by the processor, it implements a reactive power regulation method for a current source type converter with active commutation. The display unit of the control device is used to form a visually visible picture, which can be a display screen, a projection device, or a virtual reality imaging device. The display screen can be a liquid crystal display screen or an electronic ink display screen. The input device of the control device can be a touch layer covering the display screen, or a button, a trackball, or a touchpad provided on the control device housing, or an external keyboard, touchpad, or mouse, etc.

[0131] Those skilled in the art can understand that Figure 9 the structure shown in

[0132] is only a block diagram of some structures related to the solution of this application, and does not constitute a limitation on the control device to which the solution of this application is applied. The specific control device may include more or fewer components than those shown in the figure, or combine some components, or have a different component layout.

[0133] When it is detected that the operating states of the DC transmission system and the AC system connected to the DC transmission system meet the preset judgment conditions, control the actively commutated current source converter to be in the target active power mode;

[0134] Determine the target reactive power that needs to be adjusted when the actively commutated current source converter is in the active power mode, and obtain the target mapping relationship corresponding to the target active power mode; the target mapping relationship represents the corresponding relationship between the tap position of the converter transformer and the target reactive power;

[0135] According to the target reactive power and the target mapping relationship, adjust the tap position of the converter transformer so that the reactive power exchanged between the actively commutated current source converter and the AC system connected to the actively commutated current source converter reaches the target reactive power.

[0136] In one embodiment, when the processor executes the control program, the following steps are also implemented:

[0137] According to the target mapping relationship, determine the target tap position of the converter transformer corresponding to the target reactive power;

[0138] Adjust the tap position of the converter transformer to the target tap position.

[0139] In one embodiment, when the processor executes the control program, the following steps are also implemented:

[0140] Construct an AC-DC system analysis model of the DC transmission system;

[0141] Through the AC-DC system analysis model, perform simulated tap position adjustment according to different tap positions of the converter transformer, and obtain the reactive power consumed by the actively commutated current source converter corresponding to each tap position;

[0142] According to the corresponding relationship between different tap positions and different reactive powers, determine the preset mapping relationship.

[0143] In one embodiment, when the processor executes the control program, the following steps are also implemented:

[0144] Obtain the system-related parameters of the DC transmission system; the system-related parameters include at least one of the parameters of the actively commutated current source converter, the parameters of the converter transformer, and the parameters of the AC side system.

[0145] Construct an AC-DC system analysis model according to the system-related parameters.

[0146] In one embodiment, when the processor executes the control program, the following steps are also implemented:

[0147] Determine different tap positions of the converter transformer under different active powers;

[0148] By means of an AC / DC system analysis model, the simulation gear regulation is carried out according to different gears of the tap changer of the converter transformer, and the reactive power consumed by the current-source converter with active commutation corresponding to each gear is obtained.

[0149] For a control device provided in the foregoing embodiment, its implementation principle and technical effects are similar to those of the foregoing method embodiment, and will not be elaborated herein.

[0150] In one embodiment, a readable storage medium is provided, on which a control program is stored. When the control program is executed by a processor, the following steps are implemented:

[0151] When it is monitored that the operating states of the DC power transmission system and the AC system connected to the DC power transmission system meet the preset judgment conditions, controlling the current-source converter with active commutation to be in the target active power mode;

[0152] Determining the target reactive power that needs to be adjusted when the current-source converter with active commutation is in the active power mode, and obtaining the target mapping relationship corresponding to the target active power mode; the target mapping relationship represents the corresponding relationship between the tap changer gear of the converter transformer and the target reactive power;

[0153] According to the target reactive power and the target mapping relationship, adjusting the tap changer gear of the converter transformer so that the reactive power exchanged between the current-source converter with active commutation and the AC system connected to the current-source converter with active commutation reaches the target reactive power.

[0154] In one embodiment, when the control program is executed by a processor, the following steps are further implemented:

[0155] Determining the target gear of the tap changer of the converter transformer corresponding to the target reactive power according to the target mapping relationship;

[0156] Adjusting the tap changer gear of the converter transformer to the target gear.

[0157] In one embodiment, when the control program is executed by a processor, the following steps are further implemented:

[0158] Constructing an AC / DC system analysis model of the DC power transmission system;

[0159] By means of the AC / DC system analysis model, the simulation gear regulation is carried out according to different gears of the tap changer of the converter transformer, and the reactive power consumed by the current-source converter with active commutation corresponding to each gear is obtained;

[0160] Determining a preset mapping relationship according to the corresponding relationship between different gears and different reactive powers.

[0161] In one embodiment, when the control program is executed by a processor, the following steps are further implemented:

[0162] Obtain system-related parameters of the HVDC transmission system; the system-related parameters include at least one of the parameters of the current-source converter that can be actively commutated, the parameters of the converter transformer, and the parameters of the AC-side system.

[0163] Construct an analytical model of the AC-DC system according to the system-related parameters.

[0164] In one embodiment, when the control program is executed by a processor, the following steps are further implemented:

[0165] Determine different taps of the converter transformer at different active powers;

[0166] Perform simulated tap adjustment according to different taps of the converter transformer through the analytical model of the AC-DC system, and obtain the reactive power consumed by the current-source converter that can be actively commutated corresponding to each tap.

[0167] For the readable storage medium provided in the above embodiment, its implementation principle and technical effects are similar to those of the above method embodiment, and will not be elaborated here.

[0168] In one embodiment, a control program product is provided, including a control program, and when the control program is executed by a processor, the following steps are implemented:

[0169] When it is monitored that the operating states of the HVDC transmission system and the AC system connected to the HVDC transmission system meet the preset judgment conditions, control the current-source converter that can be actively commutated to be in the target active power mode;

[0170] Determine the target reactive power that needs to be adjusted when the current-source converter that can be actively commutated is in the active power mode, and obtain the target mapping relationship corresponding to the target active power mode; the target mapping relationship represents the corresponding relationship between the tap position of the converter transformer and the target reactive power;

[0171] According to the target reactive power and the target mapping relationship, adjust the tap position of the converter transformer so that the reactive power exchanged between the current-source converter that can be actively commutated and the AC system connected to the current-source converter that can be actively commutated reaches the target reactive power.

[0172] In one embodiment, when the control program is executed by a processor, the following steps are further implemented:

[0173] According to the target mapping relationship, determine the target tap position of the converter transformer corresponding to the target reactive power;

[0174] Adjust the tap position of the converter transformer to the target tap position.

[0175] In one embodiment, when the control program is executed by a processor, the following steps are further implemented:

[0176] Construct an AC-DC system analysis model for a HVDC transmission system;

[0177] Adjust the simulation gear according to different gears of the tap-changer of the converter transformer through the AC-DC system analysis model, and obtain the reactive power consumed by the current-source converter with active commutation corresponding to each gear;

[0178] Determine a preset mapping relationship according to the corresponding relationship between different gears and different reactive powers.

[0179] In one embodiment, when the control program is executed by a processor, the following steps are further implemented:

[0180] Obtain system-related parameters of the HVDC transmission system; the system-related parameters include at least one of the parameters of the current-source converter with active commutation, the parameters of the converter transformer, and the parameters of the AC-side system.

[0181] Construct an AC-DC system analysis model according to the system-related parameters.

[0182] In one embodiment, when the control program is executed by a processor, the following steps are further implemented:

[0183] Determine different gears of the tap-changer of the converter transformer under different active powers;

[0184] Adjust the simulation gear according to different gears of the tap-changer of the converter transformer through the AC-DC system analysis model, and obtain the reactive power consumed by the current-source converter with active commutation corresponding to each gear.

[0185] The control program product provided in the above embodiment has the same implementation principle and technical effect as the above method embodiment, and will not be described in detail here.

[0186] Those of ordinary skill in the art can understand that all or part of the processes in the methods of the above embodiments can be completed by instructing relevant hardware through a control program. The control program can be stored in a non-volatile readable storage medium. When the control program is executed, it can include the processes of the embodiments of the above methods. Among them, any reference to a memory, database, or other medium used in the embodiments provided in the present application can include at least one of non-volatile and volatile memories. Non-volatile memories can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetoresistive random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memories can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM), etc. The databases involved in the embodiments provided in the present application can include at least one of relational databases and non-relational databases. Non-relational databases can include distributed databases based on blockchain, etc., without limitation. The processors involved in the embodiments provided in the present application can be general-purpose processors, central processing units, graphics processing units, digital signal processors, programmable logic devices, data processing logics based on quantum computing, etc., without limitation.

[0187] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0188] The above-described embodiments merely represent several implementation manners of the present application. The description thereof is relatively specific and detailed, but it should not be construed as a limitation on the patent scope of the present application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the appended claims.

Claims

1. A reactive power regulation method for a current source converter with active commutation, characterized in that A control device applied to a DC power transmission system, the method comprising: When it is monitored that the operating states of the DC power transmission system and the AC system connected to the DC power transmission system meet a preset judgment condition, controlling the actively commutated current source converter to be in a target active power mode; Determining a target reactive power that needs to be adjusted for the actively commutated current source converter in the active power mode according to the operating requirements of the AC system and the active power corresponding to the active power mode, and obtaining a target mapping relationship corresponding to the target active power mode; the target mapping relationship represents the corresponding relationship between the tap position of the converter transformer and the target reactive power; the operating requirements of the AC system include that the AC bus voltage is within a preset voltage range, and / or the reactive power exchanged between the actively commutated current source converter and the AC system is a preset value; Adjusting the tap position of the converter transformer according to the target reactive power and the target mapping relationship, so that the reactive power exchanged between the actively commutated current source converter and the AC system connected to the actively commutated current source converter reaches the target reactive power.

2. The method according to claim 1, wherein The adjusting the tap position of the converter transformer according to the target reactive power and the target mapping relationship includes: Determining a target tap position of the converter transformer corresponding to the target reactive power according to the target mapping relationship; Adjusting the tap position of the converter transformer to the target tap position.

3. The method according to claim 1, characterized in that, The method further comprises: Constructing an AC-DC system analysis model of the DC power transmission system; Performing simulated tap position adjustment according to different tap positions of the converter transformer through the AC-DC system analysis model, and obtaining the reactive power consumed by the actively commutated current source converter corresponding to each tap position; Determining a preset mapping relationship according to the corresponding relationship between different tap positions and different reactive powers.

4. The method according to claim 3, characterized in that, The constructing the AC-DC system analysis model of the DC power transmission system includes: Obtaining system-related parameters of the DC power transmission system; Constructing an AC-DC system analysis model according to the system-related parameters.

5. The method according to claim 4, wherein The system-related parameters include at least one of parameters of the actively commutated current source converter, parameters of the converter transformer, and parameters of the AC side system.

6. The method according to claim 3, wherein The performing simulated tap position adjustment according to different tap positions of the converter transformer through the AC-DC system analysis model and obtaining the reactive power corresponding to each tap position includes: Determining different tap positions of the converter transformer under different active powers; Performing simulated tap position adjustment according to different tap positions of the converter transformer under each active power through the AC-DC system analysis model, and obtaining the reactive power corresponding to each tap position under different active powers.

7. A reactive power regulation device for a current source converter capable of active commutation, characterized in that, The device comprises: A monitoring module, configured to control the actively commutated current source converter to be in a target active power mode when it is monitored that the operating states of the DC power transmission system and the AC system connected to the DC power transmission system meet a preset judgment condition; An acquisition module, configured to determine, according to the operation requirements of the AC system and the active power corresponding to the active power mode, the target reactive power that needs to be adjusted when the actively commutated current source converter is in the active power mode, and acquire the target mapping relationship corresponding to the target active power mode; the target mapping relationship represents the corresponding relationship between the tap position of the converter transformer and the target reactive power; the operation requirements of the AC system include that the AC bus voltage is within a preset voltage range, and / or the reactive power exchanged between the actively commutated current source converter and the AC system is a preset value; An adjustment module, configured to adjust the tap position of the converter transformer according to the target reactive power and the target mapping relationship, so that the reactive power exchanged between the actively commutated current source converter and the AC system connected to the actively commutated current source converter reaches the target reactive power.

8. A control device, comprising a memory and a processor, the memory storing a control program, characterized in that, When the processor executes the control program, the steps of the method according to any one of claims 1 to 6 are implemented.

9. A readable storage medium, on which a control program is stored, characterized in that, When the control program is executed by the processor, the steps of the method according to any one of claims 1 to 6 are implemented.

10. A control program product, comprising a control program, characterized in that, When the control program is executed by the processor, the steps of the method according to any one of claims 1 to 6 are implemented.

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